Icon image for a computer display screen



FIG. 1 is a front view of an icon for a computer display screen, the broken line drawings of a computer display screen and interior features are for illustrative purposes only and form no part of the claimed design; and,

FIG. 2 is a front view thereof, on an enlarged scale; the icon is shown separately for clarity of illustration. 

The ornamental design for an icon image for a computer display screen, as shown and described. 